CVE-2025-20371 in Splunk
Summary
by MITRE • 10/01/2025
In Splunk Enterprise versions below 10.0.1, 9.4.4, 9.3.6 and 9.2.8, and Splunk Cloud Platform versions below 9.3.2411.109, 9.3.2408.119 and 9.2.2406.122, an unauthenticated attacker could trigger a blind server-side request forgery (SSRF) potentially letting an attacker perform REST API calls on behalf of an authenticated high-privileged user.
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Analysis
by VulDB Data Team • 10/09/2025
The vulnerability identified as CVE-2025-20371 represents a critical server-side request forgery flaw within Splunk Enterprise and Splunk Cloud Platform installations. This vulnerability exists in multiple version ranges including Splunk Enterprise versions prior to 10.0.1, 9.4.4, 9.3.6, and 9.2.8, alongside Splunk Cloud Platform versions below 9.3.2411.109, 9.3.2408.119, and 9.2.2406.122. The flaw allows unauthenticated attackers to exploit a blind SSRF condition that could enable them to execute REST API calls on behalf of authenticated high-privileged users, potentially leading to unauthorized access and data manipulation within the Splunk environment. The vulnerability stems from insufficient input validation and sanitization of user-supplied parameters that are processed by the application's REST API endpoints, creating a pathway for attackers to manipulate internal service requests.
The technical implementation of this vulnerability occurs when the Splunk application processes user-provided data through REST API calls without proper validation of the target URLs or endpoints. This allows an attacker to craft malicious requests that can bypass normal access controls and potentially access internal resources that should only be accessible to authenticated administrators. The blind nature of this SSRF means that attackers cannot directly observe the results of their requests but can still leverage the vulnerability to perform actions such as accessing internal services, scanning network ports, or even exfiltrating data through carefully crafted payloads. The vulnerability specifically impacts the application's ability to properly validate and sanitize external references, creating a pathway for attackers to manipulate the application's behavior through crafted input parameters.
The operational impact of CVE-2025-20371 extends beyond simple data exposure, as it enables attackers to potentially escalate privileges and gain unauthorized access to sensitive system resources. High-privileged users typically have extensive access rights within Splunk environments, including the ability to modify configurations, access sensitive logs, and manage data access controls. An attacker exploiting this vulnerability could potentially perform administrative actions without proper authentication, leading to complete compromise of the Splunk instance. The vulnerability also creates opportunities for attackers to use the compromised system as a pivot point for further attacks within the network infrastructure, as Splunk systems often have access to various internal services and databases. This makes the vulnerability particularly dangerous in enterprise environments where Splunk is used for security monitoring and log analysis across critical systems.
Organizations affected by this vulnerability should immediately implement mitigations including applying the latest security patches released by Splunk for the affected versions. Network segmentation and firewall rules should be implemented to restrict access to Splunk services, particularly limiting external access to REST API endpoints. Input validation should be enhanced at the application level to ensure all external references are properly sanitized and validated before processing. Monitoring should be implemented to detect unusual patterns in API calls that might indicate exploitation attempts. Additionally, organizations should review their access controls and implement principle of least privilege configurations to minimize the potential impact of any successful exploitation. This vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities, and maps to ATT&CK technique T1190, which covers exploitation of remote services through server-side request forgery attacks. Organizations should also consider implementing web application firewalls and intrusion detection systems to help identify and block malicious requests targeting this vulnerability.